Microsoft is already aware of the problem.

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Microsoft's January 2026 KB5074109 security update for Windows 11 (25H2/24H2) is preventing some PCs from booting, displaying a restart error message. The mandatory update, released January 13, affects a small number of computers but also causes other issues like Outlook POP freezing and brief black screens. Affected users need to use Windows Recovery or perform a clean reinstall. Microsoft is collecting data to resolve the problem.

Windows January 2026 Update is not Allowing Some PCs to Boot